Z1 Airbox

I have a 1975 Z1-B and the stock airbox is trashed. I am thinking about buying an aftermarket airbox from Redline Cycles or Z1-Enterprises. Has anyone bought a aftermarket airbox from either of these sellers? I am curious about the quality. Any info would be appreciated. Thanks.

Both of the sellers are reputable and Jeff generally only carries aftermarket 'repro' materials that are quality. The aftermarket items I have purchased from Z1E have been very nice, although I have not yet purchased an airbox.